Question

0,5-4/5(1/2-3/4:2/3)=

Answer 1

0,5=5/10( trebuie sa transformam in fractie)
5/10-4/5•(1/2-3/4•3/2)
=(aducem la numitor comun a doua fractie o amplificam cu 2)
=5/10-8/10•(1/2-9/8)
=-3/10•(4/8-9/8)
=-3/10•(-5/8)
=+15/80 [simplificam cu 5]
=3/16

Answer 2

... = 1/2 - 4/5*(1/2 - 3/4 * 3/2) =
    = 1/2 - 4/5*(1/2 - 9/8) = 1/2 -4/5*(4-9)/8 =
                                      = 1/2 - 4/5*(-5/8)=
                                      = 1/2 + 1/2 =  1